His young age has sparked a number of questions, in particular how was he able to attain a firearm.

Mr Scipione said police had spoken to the gunman’s family and how the teen gained access to a firearm would form a critical part of the investigation.

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Today police are trying to track down the teenage killer’s family who may have left the area.

3. He was of Iraqi-Kurdish background.

The 15-year-old is a naturalised Australian of Iraqi-Kurdish descent. He was born in Iran, and relocated with his family to Australia. It has also been confirmed that the teen walked to visit a Parramatta Mosque immediately prior to his shooting rampage.

Prior to being shot dead by police, witnesses claim they heard the teen yelling “Allah, Allah”.

6. Police had heard “chatter” that Parramatta might be targeted.

A police source told Fairfax that there had been “chatter” detected in the past week relating to a possible attack on the Parramatta headquarters. In response, every officer had been ordered to wear their guns on them at all times this week, even while at their desks.